B. Outline of the Electrical CircuitryThe copier’s major electrical mechanisms are controlled by a CPU (IC116) operatingin sync with 16MHz external inputs.Each principal IC on the DC controller PCB has the functions discussed below;Figure 2-102 is a block diagram showing the relationship among major circuits:IC116 (master CPU)• Controlling copying sequence.IC104 (slave CPU)• Controlling the control panel.• Controlling the lower feeder motor, blank shutter motor, and lens motor.IC115 (gate array)• Controlling writing to and reading from memory.• Controlling the fixing heater.• Controlling the scanning motor.IC124, IC103 (master ROM, slave ROM)• Serving as memory for programs.IC107 (DPRAM)• Serving as buffer memory between master CPU and slave CPU.IC109 (I/O port)• Controlling the high-voltage power supply and lamp regulator.• Turns on and off each element.IC117 (IPC)• Controlling serial communication with the DF, sorter, and pedestal.IC113 (reset IC)• Resetting appropriate ICs at power-on or power outage: IC105, IC109, IC115, IC116,IC1172-2CHAPTER 2 OPERATIONS AND TIMINGCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
